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| Grid tie inverter voltages and batteries |
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| Simon:
I'm thinking of getting a grid tie inverter as the standalone inverter really is a waste of time unless I'm really in the sticks. I'm not sure if I have this wrong but to run such an inverter from a battery it has to be rated for twice the battery voltage ? Basically I have a pair of panels so I can have 24 or 12 V output and can easily put them in series to run the inverter directly or in prallel to charge the battery which can be turned onto the inverter later (so I could store the power for when I get home and make use of it). Is my reasoning flawed somehow ? though I'd best make sure before i press the spend button. |
| NiHaoMike:
No, match voltages. Make sure the cut-in point can be adjusted so it can be used as a "regenerative" shunt regulator. |
| Simon:
well the 14-28V models say not to be connected to a 12V battery. In the past when I've ask sellers the question I've been told to use a 28-55V inverter on a 12V battery, something to do with the built in MPPT |
| Zero999:
--- Quote from: Simon on February 12, 2011, 07:34:08 am ---well the 14-28V models say not to be connected to a 12V battery. --- End quote --- That's because it's most likely designed for a 24V battery so connecting to 12V would cause it to undervoltage cut out. --- Quote --- In the past when I've ask sellers the question I've been told to use a 28-55V inverter on a 12V battery, something to do with the built in MPPT --- End quote --- What does MPPT mean? I hate clueless sellers. I would suspect a 28V to 55V inverter is designed for 48V operation not 12V. For 12V you need an inverter rated to 10V to 15V. |
| Simon:
MPPT = mean power point tracking, it was widely discussed on electrotec, in the end I've bought a 200W GTI from hong kong that say's it can be connected to a battery and is rated down to 10.5 V, I guess it will not take more than 200+over head from the battery, I've got a 74Ah battery so should cope nicely and as I've only got 40W of panels so far it is just the right size as I'll get a few more panels later, electric is going up and to be honest I see power becoming VERY exspensive in the future. Solar panel prices are falling, last year I got panels for £3/W now they are at £2.5/W, of course as soon as fuel goes up heavily they may also go up due to transport |
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