SunZilla Solar Generator 3.0

Comments from the Community

3 Comments

1. Peter Dauenhauer says:

   September 29, 2016 at 8:29 pm

   The Sunzilla 3.1 Generator has different performance profile than listed here.

   Additional information on the product would also be helpful for general evaluation.

   1. The rated PV output is 140Wp. The model design has 4x35W flexible panels branded with: SUPERFLEX SGM-FL-35W

   2. The category “number of batteries charged per day” is not detailed enough and is not very useful. Instead this should provide sub-categories, potentially adjustable when this is information is inputted. For the Sunzilla 3.1 Generator, the manufacture stated charging performance is:
   > 10 – 25 Smartphones continuous charging (depending on weather)
   > 60L refrigerator,
   > 2 or 3 laptops,
   > Water pump with purification unit (80 to 200/day)
   The manufacture estimations on loads serving capability should indicate the ratings of the load and daily duty cycle in order to be verified. In the case of Sunzilla 3.1, there is no data available.

   3. “Power Rating” is confusing. Instead this should broken down into
   a. Generation technology and capacity – for Sunzilla this would be ” 4x35W flexible mono-crystalline solar PV. Max rating 140Wp”
   b. Power Supply: 350W continuous load, 700W (peak / surge) Load

   4. “Storage Type” requires more information. It should state: “2x Yuasa NP38-12B Absorbent Glass Mat (AGM) Technology: each @ 12V 40Ah”

   5. It would be helpful to state the nominal DC voltage if applicable. In the case of the Sunzilla, this should state: “24V DC”

   6. The converters should be specified. In the case of the Sunzilla this should state: ” Charge Controller: MPPT-Battery charger, here we used a Victron- Blue-Solar-Charge-Controller-MPPT-100-15, Inverter: Victron Phoenix-Inverter-350, 350 VA, 24 V”

   7. There should be a box for warranty information if any is offered. For Sunzilla, there appears to be no warranty for the integrated system.

   8. If there are local distributors, a list of contacts should be provided with the associated country and city.

   9. “Grid Compatible” is unclear. Is this whether you could turn use this as a micro-grid/mini-grid or not, or if it is feasible to connect this directly to a centralized grid (i.e. it has a grid-tie inverter of some sort and a controller to manage balance)?

2. Peter Dauenhauer says:

   September 29, 2016 at 8:52 pm

   System charging requirements or guidelines would be helpful. This would help users determine how suited it is for particular areas.
   From a low-voltage disconnect state (usually this is 50% depth of discharge for lead-acid battery technologies) to full charge:
   1. How long should it take to recharge in hours?
   2. For PV technologies What is the Peak Sun Hours needed to achieve this full recharge?
   3. Days of autonomy should be specified for a typical (or designed) load profile or a set of profiles.

3. Peter Dauenhauer says:

   September 29, 2016 at 9:24 pm

   The Sunzilla Generator’s information needs to be updated:
   Under Performance:
   1. “Power Rating” section is a confusing title and should be changed to “Generation Technology and Capacity”. The technology and sub-components with model numbers are useful. Sunzilla should be: “0.14 kW total consisting of 4x35W Semi-flexiblemono-crystallinePV-modules SUPERFLEXSGM-FL-35W” For SunBlazer II this should state “1.8 kW total consisting of 6x 300W Polycrystaline modules” E-HUBB should state “Basic solution has a 1 to 4 kWp total capacity, but this can be expanded to larger solutions.”
   2. “Load Serving Capabilities” should be added. For Sunzilla it should state “350W continuous load, 700W peak/surge load”. For SunBlazer it should state “1500W continuous”
   3. “Battery Capacity” should be renamed to “Battery Capacity & Energy Storage” should likewise include the key components and model numbers. For Sunzilla it should state ” 2x Yuasa NP38-12B 38Ah 12V Absorbent Glass Mat (AGM) Lead Acid Batteries. Total Energy Storage = .912 kWh”. SunBlazer reads fine as is. For E-HUBB should state “undisclosed”
   4. “Maximum Batteries Charged Per Solar Day” is very confusing and should be removed. It should be replaced with “Designed Load Profiles” which can be set flexibly depending on the technology. Some systems won’t charge batteries and will only serve load, while other will only have battery charging and no directly connected loads. Details on the loads included and duty cycle, on a daily basis should be provided and several combinations of the loads could be provided, thus the assumptions would be clearly seen. Sunzilla states that it has designed systems with mobile phone charging (between 10 – 25 per day), laptops (2 or 3), small refrigerators (60L), and a water pumping solution. However, no details on the loads or specific combinations are provided. A good model for this section would be as follows (note the values are not real and not relevant to Sunzilla – only for making the example):
   1. Load Profile: Phone charging station
   a. 40x smart phones charged per day, 4 cycles per day, 10 phones per charge cycle of 2 hours @10W each = 100W peak power, 800Wh load per day
   b. 1x laptop, 4 hours of use per day @50W = 50W peak power, 200Wh per day

   2. Load Profile: Water pumping and filtration system
   a. 5x smart phones charged per day, 5 cycles per day, 1 phones per charge cycle of 2 hours @10W each = 10W peak power, 100Wh load per day
   b. 1x laptop, 4 hours of use per day @50W = 50W peak power, 200Wh per day
   c. 1x water pump, 4 hours of use per day @200W = 200W peak power, 800Wh per day

   3. There should be another section entitled “Converter technology”. for sunzilla this should state: “Inverter Victron phoenix 24/350 Charge Controller Victron blue solar 100/15” For SunBlazer this should state “Unspecified MPPT Controller managing station battery charging. 10 to 20 charging channels for Universal Portable Battery Kits – up to 20. Controller can optionally be supplied by an external AC source (1000W) or be directly connected to an AC load (up to 1500W 230 VAC 50/60Hz)”

   4. The nominal DC voltage should be state, where applicable. In the case of Sunzilla, this should be “24V DC Nominal”. For SunBlazer it should state “24V or 48V DC”

   5. “Grid Compatible” is unclear. This could mean either that the technology could be used to make a mini-/micro- grid, OR, that it can feasibly be connected to a main grid, and contained the relevant control equipment to do so (i.e. grid-tie inverter). If the latter usage is intended, the converter details should be included.

   6. “Warranty Information” Should be added. It appears that Sunzilla has no warranty for the integrated product, though surely the Victron converters have warranties. SunBlazer appears to have no warranty for the integrated product.

   7. “Performance data and communications” should be added. This should if any on-board system monitoring and data acquisition takes place (and details of this) for example if voltage and amperage is monitored and stored. Secondly, if there is a communications module to transmit data and visualization module to view data either locally or remotely. Sunzilla and SunBlazer currently do not provide any information on this feature. The E-HUBB has “On board technical system monitoring integrated with a financial customer management. Local Visualization.”

   8. For Related Academic literature, SunBlazer should be ranked as a 2 of 5 as there are a number of articles in academic journals and conferences which reference the solution and business model. I can provide some links to these if needed. The other solutions did not have any academic literature that was available after a short review.