IEEE We propose a set of theoretical and practical tools for stabilization of DC networks. In order to do so, we introduce a new framework to study the dynamics of DC grids, that permits to combine power converter models with those of impedances – directly in higher-order terms. This mathematical setting includes a convenient modeling specification that allows: to analyze complex high-gain converter topologies; and to develop an energy-based stability analysis for DC grids with potential destabilizers such as loads with negative impedance characteristics (e.g. constant power loads). We show that instability problems arise due to a power imbalance between passive and non-passive loads, hence power balancing is a suitable stabilizing mechanism. Moreover, a low-cost hardware solution that ensures stability is provided, in the form of a lossless (H-bridge) stabilizing filter. The new theoretical results combined with the proposed implementation, offer a low-cost alternative with respect to other (battery/super-capacitor) energy-storage-based existing strategies. Experimental results, based on a high voltage gain quadratic converter feeding multiple non-passive loads, are included.