Van battery solar trickle charger

Is it possible to have a clear window fitted to your van's cover? 🤔

Why not slip them a tenner a month to cover the costs of using there drive and power. cheaper than all storage sites and probably closer.

Why not buy a plug in Watt meter so what you take is evident and can be refunded. I actually think the amount will be trivial if it is only the battery and an alarm type of load; but this solution is cheap, non intrusive, expedient and equitable;

https://www.amazon.co.uk/230V-250V-Monitor-Consumption-Calculator-Analyzer/dp/B07FZZ17ZY?ref_=s9_apbd_otopr_hd_bw_b27Ar03&pf_rd_r=RPW7TA7J122KV76H6YQ0&pf_rd_p=b2af2a7c-7eb4-5af0-aab9-5a0684350ebe&pf_rd_s=merchandised-search-10&pf_rd_t=BROWSE&pf_rd_i=1938287031

You are in a much better position to know if they'd consider that 'offensive' as it was offered in a generous spirit and as a 'kindness'? You could give flowers or a meal/cinema voucher as a thank you. It's not about the money saved on storage or that taken for the electric but showing appreciation for their gesture.

Personally I'd go for a solar panel that would enable use off grid should you ever choose it or if it were necessary. What we paid for storage per year would give a really good set up, as well as the gesture 😉

Sincere apologies I've just caught the post where you say you have a solar panel already but it's under the cover. Please ignore my 2nd paragraph re fitting one. 😱😱. Once you've removed the cover and start touring again you maybe able to have a clear piece inserted, as MollysMummy suggests?

Or a very long cable for EHU

So if you already have a solar on top of the van then you already have a solar controller/regulator/charger fitted.

You can buy a flat panel solar panel and just wire it into the input of your controller. You will need to extend the wires (2mm2 cable) on the panel and have an inline plug so you can just disconnect. Just hang it between the mirrors with some string. 

The yacht type panels are the most robust and are waterproof something like https://www.ebay.co.uk/itm/New-50W-Solar-Panel-for-Boat-Marine-Caravan-RV-Charging-12V-Battery-UK/163992142194?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3Dbea766fc16fc497aa4c7d30d9e3c6c6a%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dco%26sd%3D303162030399%26itm%3D163992142194%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWeb&_trksid=p2047675.c100005.m1851

I am surprised that the battery only lasts two weeks. Before we had a motorhome we stored our caravan which had alarm and tracker. The battery would last a couple of months although we used to take it out and recharge more frequently than that. Our motorhome, like many, has a solar panel on the roof. I take it for a run once a month and without the solar panel I would have expected this to be adequate for charging the battery.

Maybe there is a current drain other than the alarm or perhaps the cab battery is reaching end of life?