I've been thinking about switching from a 12 volt to a 48 volt system. The intention would be to assemble the cells myself in a ready-made housing. Can horizontal housings also be used in a vertical position, or will there be too much compression on the cells? The intention would be to assemble a 15kw battery with Eve MB31 314ah cells. Is there any experience with those cells? What about a 200ah BMS? What would be the best BMS unit at the moment that would work with Victron? Which housing would be good? Since it's cold here in Finland in the winter, are there any experiences with heating mats? Do they work in those? If we go to the cottage in the cold, will the cells warm up if I increase the load for a short time, without a heating mat? Although the battery would probably winter just fine even in the cold and I can heat it up without a mat when I go to the cottage? I'd like some experiences with a good vertical housing that has everything I need. should also be available from EU warehouse. The best of what is currently on sale would of course be in mind.