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Battery charger & inverter

I have a max 6 amp supply on landline in marina. Can I run a battery charger permanently on my 5 x 110 amp/hr batteries and have a 2Kw inverter permanently connected? This would allow me to occaisionally draw more than the 6 amps allowed on the land line. I normally have lights, bilge and water pumps and radio on 12 volts, and fridge (absorbtion), tv (15" flat screen), microwave, lap top and various rechargeables (mobile, torch etc.)on mains. Do I need to do anything about earthing the mains side, and will there be increased decay of the sacrificial anodes.
thanks in anticipation
Robsuch drank

Asked by: Rob Francis  | 2.39pm, Monday 14 June

WW says:

The simple answer is yes!
Many "combi" inverter/chargers allow you to select the maximum current that the charger can take, and then supplement the 230V supply from the inverter.
Most battery chargers can act as powerpacks, supplying their full current as required, when the demand is placed on them. A 30A charger will require around 400W of mains power (drawing around 2A).
As for earthing, the shoreline connection must be earthed properly, preferably through a galvanic isolator, to avoid stray currents causing the anode problems you mentioned.
It is important that the inverter side is also earthed and this is probably best done through a dedicated line, although it is usual that the hull is earthed to the inverter- there shouldn't be stray currents from your inverter (as that should trip the system), and the galvanic isolater will protect the boat from effects of other earth lines when connected.
If in doubt, have a good look at the code of practice for installation in boats; also, (free) publications, such as "The Energy Book" from MasterVolt are quite useful references.
Hope that helps!

Mark Langley  | 4.23PM, Monday 14 June

Readers say:

Thanks Mark

Rob Francis  | 7.48AM, Tuesday 15 June

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