field test

PV Modules

A real world comparison between Mono, Poly, PERC and Dual PV Modules.

Realtime data
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Installation date: 09-03-2020
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Irradiance
Romania
44°17'59.9"N
26°11'29.7"E

Mono

2500Wp --
Total solar yield: --

Split-cell

2500Wp --
Total solar yield: --

Poly

2500Wp --
Total solar yield: --

PERC

2500Wp --
Total solar yield: --

* This is a field test and the results are specific for this installation on this location, please research which is the best solution for your own situation as the results can be different based on environmental influences.

Hub-1 available!

Update Monday December 12th 2016: all polices except policy 3 (Disconnect from mains when possible), have been deprecated in favor of ESS

Update Monday November 7nd 2016: removed all mentions of the VE.Can to VE.Bus interface, since it is no longer required.

Update Saturday March 8th 2014: added FAQ item about interface price

 

 

So, as everyone has been able to witness, this was quite some more work than we anticipated. But now, in a little rush before the weekend, I have the honor to bring the good news: it has been done!

hub1-intro

What is Hub-1?

Solar chargers will normally reduce their power when the batteries become full. Otherwise they would overcharge the batteries. Solar power is obviously wasted when reducing the output power. For off-grid systems one could start a pump, or a heater, or do something else that uses this ‘excess’ power. And in on-grid systems in countries with a feed-in tariff it would pay to keep converting at the Maximum Power Point, and then have the Multi feed that surplus back into the grid. And that is exactly what we call a Hub-1 system: as soon as batteries are becoming full, the solar charger will keep operating at the maximum power point and ‘push’ as much power as possible on to the DC. The Multi, in constant communication with the Solar charger, will take that excess power and feed it back into the grid.

More background information about Hub-1 can be found in my previous blogpost about Hub1, and in my father’s excellent brochure about Self-consumption and Energy Storage.

Hub-1 allows several selection policies, as explained on this page of the Assistant:

hub1-selection

Requirements

FAQ

Can I make an Hub-1 system with the other Victron solar chargers (75/15, 75/50, … )?
Yes.

What about Multi Compacts, can they be used?
Yes, they can be used. There is a disadvantage though: when inverting, and therefore disconnected from the Grid, the Multi Compact cannot quickly switch back from Inverter mode to  the grid in case of an overload. This means that it is not possible to use Multi Compacts for systems with a possible load higher than the maximum inverter power.

Where can I find an Anti-Islanding device?
Ask your Victron representative. The regulations differ per country, see also Google and search for ENS and/or Anti-Islanding device.

Conclusion

I am sure there are many more questions, please use the comments. Early next week I’ll add a schematic that shows the system.

Have a good weekend! Matthijs

Avatar of Matthijs Vader
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