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Alternative Power
mygoggie's venture in the world of hybrid electrical systems
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<blockquote data-quote="mygoggie" data-source="post: 1109569" data-attributes="member: 18916"><p>Dankie [USER=18948]@Gerlach[/USER]. At the moment the system is designed for three seperate inverter AC circuits that can be run individually with no phasing necessary. The parallel bus bars is an option I am considering for the reasons you stated. However as stated below, there is a limit of batteries connected together which will nullify the busbar setup.</p><p></p><p>Input from PV will be from three banks, E, N and W facing. I can always add more panels in each bank and form islands in each bank, each island feeding a MPPT to decrease the current flowing to the busbar. Most quality MPPTs can have high DC voltage input and deliver 12V onto the battery bank.</p><p></p><p>The one unknown here is how to ensure the LiFePO4 batteries is correctly connected as I see there is a limit on the number of batteries that can be connected in parallel and/or series. This limit is an issue for me when running a 12V system. I am still trying to understand why Blue Nova is putting specific limits on their BN13V batteries. This then two in parallel and four in series. My guess is that the onboard BMS is the issue. Is there a way around this limit?</p><p></p><p>My gut feeling is to sell the 12VDC inverters and upgrade this to a higher input voltage inverter. Another option is to install micro inverters from each PV panel to the main entry where these inputs are synced and summed. So many options ...</p></blockquote><p></p>
[QUOTE="mygoggie, post: 1109569, member: 18916"] Dankie [USER=18948]@Gerlach[/USER]. At the moment the system is designed for three seperate inverter AC circuits that can be run individually with no phasing necessary. The parallel bus bars is an option I am considering for the reasons you stated. However as stated below, there is a limit of batteries connected together which will nullify the busbar setup. Input from PV will be from three banks, E, N and W facing. I can always add more panels in each bank and form islands in each bank, each island feeding a MPPT to decrease the current flowing to the busbar. Most quality MPPTs can have high DC voltage input and deliver 12V onto the battery bank. The one unknown here is how to ensure the LiFePO4 batteries is correctly connected as I see there is a limit on the number of batteries that can be connected in parallel and/or series. This limit is an issue for me when running a 12V system. I am still trying to understand why Blue Nova is putting specific limits on their BN13V batteries. This then two in parallel and four in series. My guess is that the onboard BMS is the issue. Is there a way around this limit? My gut feeling is to sell the 12VDC inverters and upgrade this to a higher input voltage inverter. Another option is to install micro inverters from each PV panel to the main entry where these inputs are synced and summed. So many options ... [/QUOTE]
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mygoggie's venture in the world of hybrid electrical systems
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