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Bigger solar panels on a BMS

What is the maximum solar panel capacity for a REDARC BMS1215?

 

 

Question

 

The BMS1215 can use solar panels up to 240W, what will happen if I have a 480W panel set up?

 

Answer

 

The excess rating will not harm the BMS1215, it will just not be fully used during periods of maximum sunlight. The bigger panels will not be a total waste though, as a 480W set up will still allow the BMS to work at maximum capacity in lower lighting conditions than a 240W set up would.

 

As an illustration:

 

A 240W panel may allow the BMS1215 to deliver its full 15A charging current from 10AM to 2PM (15A for 4 hours= 60 Amp Hours) whereas a 480W panel setup in the same installation might allow the BMS1215 to deliver its full 15A charging current from 9AM until 3PM (15A for 6 hours=90 Amp Hours).

 

So, even though a 480W panel is bigger than the BMS1215 can fully use, a 480W panel will still get more Amp Hours into your battery each day than a 240W panel.

 

 

Question

 

The BMS1230 can use solar panels up to 480W, what will happen if I have a 960W panel set up?

 

 

Answer

 

The BMS1230 can use up to 480W from solar panels. Having more panel capacity than this will not damage the BMS1230, but the extra capacity will  not be fully used during periods of maximum sunlight. More panel capacity will not be wasted though, as a larger set up will allow the BMS1230 to deliver full output current in lower lighting conditions (such as earlier or later in the day, or in overcast weather) than a 480W set up would.

 

As an illustration:

 

A 480W panel might allow the BMS1230 to deliver its full 30A charging current from around 10AM to 2PM (30A for 4 hours= 120 Amp Hours) whereas a 960W panel setup in the same installation might allow the BMS1230 to deliver its full 30A charging current from around 9AM until 3PM (30A for 6 hours=180 Amp Hours).

 

So, even though a 960W panel is much bigger than the BMS1230 can fully use in the brightest part of the day, it will still get more total Amp Hours into your battery each day than a 480W panel.