jrcromer
Sol-Ark Senior Technical Manager
- Joined
- Apr 13, 2022
- Messages
- 102
Fortress here. Do you have a need for additional power as well as additional battery capacity? Best bet is to get a small 48V inverter and use a cascading system architecture (ie ac coupled grid to load to grid to load). Lots of “obsolete” 48V battery inverters are perfect for this. If not, fill out a support ticket every now and then and request a refurb unit for expansion. We don’t usually have them available, but we do get them from time to time.
Edit: Will has offered differing advice on this. The DIY crowd is usually more adventurous than manufacturer warranties allow. But BMS units are intended to play defense, not offense. I’d look to the solar industry for guidance on this - are 200W modules allowed in parallel with 300W strings on the same MPPT? What about in series? Series is worse than in parallel, but that doesn’t mean parallel is allowed.
Edit: Will has offered differing advice on this. The DIY crowd is usually more adventurous than manufacturer warranties allow. But BMS units are intended to play defense, not offense. I’d look to the solar industry for guidance on this - are 200W modules allowed in parallel with 300W strings on the same MPPT? What about in series? Series is worse than in parallel, but that doesn’t mean parallel is allowed.
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