Calira Charger Power Distribution Units are robust and sophisticated units. 

If you have a battery bank larger than that recommended by the manufacturer, both the Battery Bank and the Charger life will be shortened. The Calira 30/20 and 38/20, both 20amp chargers, will support a battery bank no greater than 200Ah maximum. Bear in mind that the Calira range also charge the Starter Battery so an allowance must be made for this as well of about half the Starter battery Ah. For example if you have a 110Ah habitation battery and a 100Ah Starter battery, then the loading will be approximately 110Ah + 50Ah = 160Ah. A battery bank of 2 x 110Ah plus 50% of the Starter 100Ah = 270Ah.  

The Calira 17/12, 12amp charger, will support only 120Ah. 

See the 'Battery Capacity' label on the Calira 38/20 below of 70 - 200Ah as an example

Using an inappropriate sized battery bank will damage the Calira and invalidate any warranty. 

Note the wording on the front that states, "Suitable for Gel or Lead Acid Batteries"? Clearly the unit does not support AGM batteries which require a different charging profile. The unit will not get the best from an AGM battery which may not be properly charged, as little as 75% of potential in some circumstances,  resulting in short battery life and subsequent charger failure. AGM batteries will also take longer to charge than a quality Wet Acid Battery. 

When used with a calira 30/20 or 17/12 style unit a 110Ah AGM battery will behave more like a 80Ah battery, take twice as long to charge and have a shorter life. Not the best value for money when they cost twice as much as a better performing Varta/Bosch Wet battery.

Leaving the Calira hooked up to the mains during long term storage will shorten its life significantly. When not in use just connect 240v Hook-up for a couple of days a month.

Whatever the failure, we have the solution. We can repair most Calira units and hold a stock of remanufactured items, click here to see our full stock list.


Please take care when installing Solar on a Calira 30/20 equiped Motorhome as serious issues can result on the Renault and some Ford Transit Base vehicles. DO NOT USE a Battery Master style device on these vehicles to trickle charge the Starter battery.


For more information on how to contact us use the Contact Us page.

Phone : Allan - 07803 072636