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Beginners Solar Project tips needed

  • 08-03-2016 2:05pm
    #1
    macnab
    Registered Users, Registered Users 2 Posts: 1,505 ✭✭✭


    I have just inherited 4 x 12v lead acid batteries, rated at 144ah each.
    They are in fantastic condition so I decided now is the time to get serious about solar, at a stand alone project level.
    My workshop has 3 cheap solar panels from Maplins attempting to charge various batteries and never quite succeeding. What I have learned from them is its very easy to spend (waste) money on technology you dont understand!!

    So I am looking for advice or links to advice online so I can build a stand alone system. I am thinking one panel per battery, so 4 panels, 4 charge controllers, not sure about inverters. I would like to run my workshop lights and 13a sockets off this system and have it as a backup to my house supply in case of power cuts.

    Thanks.


Comments

  • #2
    [Deleted User]
    Posts: 5,238 ✭✭✭ [Deleted User]


    I reckon this a capable, versatile Workshop Rig.
    It'll run artificial mains, truck/motorhome appliances & 24V lighting.
    If you put a smaller fuse (125A) just upstream of the inverter a major inverter fault on the DC side won't take your lights out too.

    379891.jpg

    The budget version is use a Morningstar ProStar 30A Controller with a display instead of the SC-2030, the TriMetric and the shunt. You'd also gain some almost useful Low Voltage Disconnect features and transistorised isolators.
    Avoid cheap controllers it's the most important part.
    Avoid expensive controllers they're overrated for small rigs.

    If you'd like to spend extra now to make the system upgradable to 48V later and expand the solar panel to 2kWp(with a new inverter/charger) I'd swap the solar controller for a TriStar 45.

    Cable spec-ed to 150A (3.5kW) max load.
    Controller sited less than two meters from battery for correct regulation.
    Controller needs voltage sense wires and a temperature sensor preferably one that lives attached to a battery.
    Parallel series batteries with power terminals crossing the entire bank.

    With the SC-2030 the TriMetric meter is the voltage sense wire and it's highly user adaptable. Meters are indispensable diagnostic tools.

    Maplin are the double the price of the competition on modules, cables and connectors. Their controllers are low end. Highwaymen!
    Solar is €1 per watt for 24v and above (grid tie modules) and €1.20 per watt for 12V (36 cell).

    Earth neutralising link indicated for a high end inverter. Refer to inverter manual / electrician etc. for correct earthing proceedure of your installation.


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