<div dir="auto">Wrenches, Jason<div dir="auto">I have done this when l dont want tranfer switch operation but you are looking for 400 amps at 51vdc that around 20 kW of charger. l used golf cart chargers but you may want to consider a forklift charger, they are quick and basic, the BMS/U will manage the charge rates anyway. I would run everything through a shunt for monitoring either through the box or via an eguage and DC shunts. You should be able to let the inverter turn on genny but programmed as a DC charger not AC at least with Outback we can do that. Fun times</div><div dir="auto">Jerry </div><div dir="auto">NABCEP PV Inspector </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 21, 2020, 5:28 AM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I actually need 400Adc at 51V nominal of total charge rate. I was hoping to use 100Adc chargers for redundancy, or some combination of 2-8 chargers to reach the needed current, assuming they can be synced up. I don't think the charging algorithm needs to be complicated. We are basically bulk charging the LiPOs to 80% with the battery BMS controlling the generator. The concept is to get to 80% sometime in the night and solar kicks in during the day to reach 100% using 2-stage charging from the XW charge controllers.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The problem I have is the quad XW6048s in the system run at a pretty good load typically... often over 50%. This is off-grid with generator backup. The transfer switches in the XW6048 are causing surges and brownouts when the switched loads are high, especially smart dimmers and televisions. I need seamless power for this client. My thought is to abandon the internal chargers in the XW6048s and just run loads off inverter power full-time. I would charge the batteries with external battery chargers. The tricky part is how to adjust the charge rate based on load, and also based on solar input. I need to limit the net charging current. Of course, I still need 400Adc of charging current, which I'm learning might be hard to find. I don't really want to buy four more XWs - that's a pretty expensive solution. </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Jason Szumlanski</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Florida Solar Design Group</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 17, 2020 at 4:26 PM Dave Angelini Offgrid Solar <<a href="mailto:offgridsolar@sti.net" target="_blank" rel="noreferrer">offgridsolar@sti.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p>I use the CSW 4048. It has a 50 amp charger. A good spare for clients. Get 2 of them. Repurpose an old Radian or XW well over 100A. XW+ is 140adc.</p>
<p><strong><span style="font-size:small">Dave Angelini Offgrid Solar</span></strong></p>
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<p>On Fri, 17 Apr 2020 14:21:14 -0400, Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank" rel="noreferrer">jason@floridasolardesigngroup.com</a>> wrote:</p>
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<div dir="auto">I'm looking for a standalone 51V nominal battery charger suitable for a LiPO battery with 2-stage charging and adjustable setpoints for max current and battery voltage. It would require dual chargers with 100A capacity (I want dual chargers for redundancy so I have at least 50% capacity if one goes bad). Ideally they would sync up so they change stages simultaneously, but I'm not sure if that's really important.
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<div dir="auto">Who makes something like that?</div>
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<div dir="auto">Jason Szumlanski</div>
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